spitball

/S P IH1 T B AO0 L/
noun
  1. 1

    A pitch of a baseball that has been partly covered with saliva, illegal at most levels.

  2. 2

    A balled-up piece of paper, moistened with saliva (by chewing) and shot through a drinking straw.

verb
  1. 1

    To moisten the ball with saliva before pitching it.

  2. 2

    To brainstorm ideas.

    โ€œ1950s.โ€

Source: https://en.wiktionary.org/wiki/spitball